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jbd2: add a helper to find out number of fast commit blocks

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Add a helper to read number of fast commit blocks from jbd2 superblock
and also rename the JBD2_MIN_FC_BLKS to
JBD2_DEFAULT_FAST_COMMIT_BLOCKS since this constant is just the
default number of fast commit blocks to use in case number of fast
commit blocks isn't set in jbd2 superblock.

Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20201120202232.2240293-2-harshadshirwadkar@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Harshad Shirwadkar 2020-11-20 12:22:32 -08:00 committed by Theodore Ts'o
parent 941ba122ca
commit 9bd23c31f3
2 changed files with 10 additions and 7 deletions
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8
fs/jbd2/journal.c
View File

@ -1869,9 +1869,7 @@ static int load_superblock(journal_t *journal)
if (jbd2_has_feature_fast_commit(journal)) {
journal->j_fc_last = be32_to_cpu(sb->s_maxlen);
num_fc_blocks = be32_to_cpu(sb->s_num_fc_blks);
if (!num_fc_blocks)
num_fc_blocks = JBD2_MIN_FC_BLOCKS;
num_fc_blocks = jbd2_journal_get_num_fc_blks(sb);
if (journal->j_last - num_fc_blocks >= JBD2_MIN_JOURNAL_BLOCKS)
journal->j_last = journal->j_fc_last - num_fc_blocks;
journal->j_fc_first = journal->j_last + 1;
@ -2102,9 +2100,7 @@ jbd2_journal_initialize_fast_commit(journal_t *journal)
journal_superblock_t *sb = journal->j_superblock;
unsigned long long num_fc_blks;
num_fc_blks = be32_to_cpu(sb->s_num_fc_blks);
if (num_fc_blks == 0)
num_fc_blks = JBD2_MIN_FC_BLOCKS;
num_fc_blks = jbd2_journal_get_num_fc_blks(sb);
if (journal->j_last - num_fc_blks < JBD2_MIN_JOURNAL_BLOCKS)
return -ENOSPC;

9
include/linux/jbd2.h
View File

@ -68,7 +68,7 @@ extern void *jbd2_alloc(size_t size, gfp_t flags);
extern void jbd2_free(void *ptr, size_t size);
#define JBD2_MIN_JOURNAL_BLOCKS 1024
#define JBD2_MIN_FC_BLOCKS 256
#define JBD2_DEFAULT_FAST_COMMIT_BLOCKS 256
#ifdef __KERNEL__
@ -1692,6 +1692,13 @@ static inline int jbd2_journal_has_csum_v2or3(journal_t *journal)
return journal->j_chksum_driver != NULL;
}
static inline int jbd2_journal_get_num_fc_blks(journal_superblock_t *jsb)
{
int num_fc_blocks = be32_to_cpu(jsb->s_num_fc_blks);
return num_fc_blocks ? num_fc_blocks : JBD2_DEFAULT_FAST_COMMIT_BLOCKS;
}
/*
* Return number of free blocks in the log. Must be called under j_state_lock.
*/